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Evidence-based Searching

Evidence-based Searching. Karen Hutchens & Debbie O’Reilly. Winter 2014. Objectives. To understand that there is a process to systematically search the literature to find the best available evidence To learn how to develop an answerable question using the PICO approach

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Evidence-based Searching

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  1. Evidence-based Searching Karen Hutchens & Debbie O’Reilly Winter 2014

  2. Objectives • To understand that there is a process to systematically search the literature to find the best available evidence • To learn how to develop an answerable question using the PICO approach • To identify evidence-based practice resources and learn how to use them efficiently and effectively

  3. What is Evidence based practice? Evidence-based practice is the integration of the best research evidence with clinical expertise and patient values to facilitate clinical decision making (Sackett, Strauss, Richardson, Rosenburg, & Haynes, 2008 as cited in Neville & Horbatt, 2010) Carnwell (2001) defines EBP as the systematic search for, and appraisal of, best evidence in order to make clinical decisions that might require changes in current practice, while taking into account the individual needs of the patient.

  4. What areas of nursing practice might we want to ask EBP questions about? You might ask questions about a range of categories of practice: • Assessment – how to properly gather and interpret findings? • Causes of the problem – how to identify them? • Deciding what the problem is – where the symptoms/signs indicate a range of possible problems how do you decide which is most likely? • How to select and interpret tests used to identify problems and to monitor patient progress? • How to estimate the likely clinical progression of a condition/illness and any likely complications? • How to select interventions that do more good than harm and that are worth the effort and cost of doing them? • How to reduce the chance of the problem reoccurring or how to promote health? • How to keep up to date; improve your skills; and run a more effective/efficient nursing team? • How best to understand the perceptions of individuals and groups e.g. service users and carers

  5. Why is best evidence and evidence based nursing important? • Ensures patient/clients receive the care that fits their needs • Facilitates sound decision making and makes it more explicit • Minimises risk to the patient/client so that benefits outweigh harm • Provides the nurse with the skills and knowledge to evaluate healthcare literature and practice • Exposes gaps in knowledge and conflicts in evidence

  6. 4 Steps to Searching • Design an answerable question • Determine the type of question that you are posing • Determine the type of study that will best answer your question • Search the literature

  7. Designing an Answerable Question A well-built clinical question should have 4 components. The PICO model is a helpful tool that assists you in organizing and focusing your question into a searchable query. Dividing into the PICO elements helps identify search terms/concepts to use in your search of the literature. PICO P – population/patient/problem (among_______) I – intervention (does __________) C – comparison/control (versus _________) O – outcome (affect __________)

  8. Designing an Answerable Question Clinical scenario: Our patient is a 45-year old female who is experiencing moderate depression. After surfing the web, she believes St. John’s Wort will cure her symptoms with less risk than conventional antidepressant medications.

  9. Designing an Answerable Question From our clinical scenario: P –adults experiencing (moderate) depression I – St. John’s Wort C – antidepressants O- relief of symptoms

  10. Clinical Question • For adult patients with moderate depression, is St. John’s wort more effective for symptom relief than antidepressants?

  11. Determine the Type of question you are posing Question Type: • Diagnosis • Therapy • Prognosis or Natural History • Etiology or Harm • What is the best STUDY DESIGN to search for to find evidence to answer your clinical question?

  12. Type of Study • Randomised Controlled Trial • Systematic Review • Meta – analysis • Cohort study • Case – control study • Cross sectional study

  13. Clinical Scenario #1 Clinical Scenario #1 • On morning rounds in the Oncology unit, a first year student turns to you for consultation. She wants to discuss options for managing moderate nausea and vomiting that result following chemotherapy. She shares an experience a relative had taking ginger when prochlorperazine didn’t provide effective relief and asks for your input. What is your clinical question in PICO format? What type of clinical question is this? What is the best study design to answer this type of clinical question?

  14. Answerable Clinical Question #1 PICO: • P – In patients receiving chemotherapy who are experiencing moderate nausea and vomiting • I – is the use of ginger • C – as effective as prochlorperazine • O – in reducing nausea and vomiting? Type of Question: Therapy/Treatment Type of Study/Methodology: Double-Blind Randomized Controlled Trial; Systematic Review/Meta Analysis of RCT

  15. Clinical Scenario #2 Working on the Developmental Assessment Team for school-aged children of mothers who used cocaine during their pregnancy, you are interested in learning the developmental outcomes for these children as they begin school compared to children not exposed to cocaine during pregnancy. • What is your clinical question in PICO format? • What type of clinical question is this? • What is the best study design to answer this type of clinical question?

  16. Answerable Clinical Question #2 PICO: • P – (controlling for confounding factors) Do otherwise healthy children • I – exposed in utero to cocaine, • C – compared to children not exposed to cocaine • O – have increased incidence of learning disabilities at age six years? • Type of Question: Harm/Etiology • Type of Study/Methodology: Cohort Studies

  17. Sources of EvidenceOriginal research and reviews published in journals The Cochrane Library • Intl organization makes available systematic reviews of effects of healthcare interventions • Up-to-date PubMed/CINAHL • Free provided by NLM • MUN access UpTODate • Evidence based clinical info • Quick and easy/point of care

  18. Using PubMed Go to: www.library.mun.ca • Click on articles tab • Under To find articles on any topic, please make a selection below; Select nursing or medicine • Click on Pubmed

  19. Pubmed Home MeSH database – medical thesaurus -Can do searches from here

  20. Search statement Type in “depression AND St. John’s wort AND antidepressant*” Hints: check MeSH database Study type? Limits Subheadings depression AND (hypericum OR St. John’s Wort) AND antidepressant*

  21. How to save results To temporarily save results: • Click the check box to the left of the citations you want to save. • From Send to, select Clipboard. • To view your selections, click the Clipboard items link.

  22. To Print • Save citations in clipboard • Then save citations Send to: file • Click Create File • OK • Click File and Print

  23. Setting Search Limits To set limits on your search, click on the limits link near the top of the page

  24. Remember • Pick out PICO • Determine question type • Determine type of study • Select appropriate databases & do search

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